I would say you have a couple of approaches here dependant on which you preferred ...
Firstly the avoid your coccy weakness entirely. You could have a bag of grapes in the fridge (or whatever superfree food you like, but ensure it is quick to grab, bitesize pieces). Whenever you are in the fridge and feeling drawn toward the choccy divert your hand to the grapes and have a couple of those. With this method you may even find in time that it is the grapes your hand goes for in the first place.
You could do the 5-minute rule - I did this when I gave up smoking. If you have a 'craving' for something, doesn't matter what, and your willpower is low then tell yourself you can have it in 5 minutes if you still want it. Then because you are not telling yourself you CAN'T have it you don't feel like you are missing out at all, and the craving only lasts a few seconds so by the time 5 minutes is up your willpower is back up to strength and you will likely decide against having it.
The alternative is to work WITH your craving. If chocolate is your thing, and at this time of year Easter eggs in particular, then set aside a certain amount of syns per day and weigh out the appropriate amount of chocolate for those syns. Keep it away from everyone else's chocolate and make it clear that it is YOURS and nobody is to touch it. Then when you are at the fridge and want some you can take from your own pile and know you are staying on plan. Temporarily for Easter you could even allow yourself a few extra syns for a couple of days. You can then choose syn-free/low-syn meals to ensure you are still full and eating enough.
